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Finding the Fourth Proportional to 862.11, 1,291.95 and 645.84

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Solution

The fourth proportional to 862.11, 1,291.95 and 645.84 is: 967.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.11 : 1,291.95 = 645.84 : x
  2. Step 2: Convert to fraction form
    862.11/1,291.95 = 645.84/x
  3. Step 3: Cross multiply
    862.11x = 1,291.95 × 645.84
  4. Step 4: Simplify right side
    862.11x = 834,392.99
  5. Step 5: Solve for x
    x = 834,392.99/862.11
  6. Step 6: Final answer
    x = 967.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.